How many "nuts" has your girlfriend dated? If it's more than one, you need to run, not walk, run away.
But let's really examine the facts here:
1. Your girlfriend was thrown from a moving Corvette.
Did he just all of a sudden snap? Chances are that was not the first time, maybe the worst, but not the first. I would consider why she would date someone who would throw her from a car. Is she a bad judge of character? Or did he have money, hence the Corvette, which she liked? I'm leery of women who would date a guy who drives a Corvette. (did she by chance date other guys who drive Camaros or Trans Ams or Mustang GTs?)
2. She ruptured a boobie.
"...sticks her hands in your shirt thread." HMMM?
It's not funny, but I'm starting to put the pieces together.
3. She's just now telling you all of this?
Step back and take a look at this from an unemotional point of view. Same song, different verse...
Sounds like you're getting played like a rookie. Hope it works out. I wouldn't be posting the type of crap you did on the internet though.
Blake